CVE-2026-85172: n8n before 2.34.1 SSRF via Request Helper URI Validation Bypass

Severity: medium (CVSS 6.4 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-09-03 · updated 2026-10-29
Weakness: CWE-918

Description

n8n versions before 2.34.1 contain a server-side request forgery vulnerability in the legacy request helper function exposed to Code and Function nodes. The validation logic checks the uri property for SSRF safety while the underlying HTTP client uses the url property when both are present, allowing attackers to bypass validation by supplying a safe uri alongside a malicious url to access internal addresses.

Affected products

n8n-io n8n: before 2.33.4; 2.34.0 (and their updates) — fixed in 2.33.4
n8n-io n8n: from 2.34.0 before 2.34.1 — fixed in 2.34.1

How to fix

Upgrade to a fixed version: n8n-io n8n 2.33.4; n8n-io n8n 2.34.1. Check the vendor advisory for mitigations.

References

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